feat(bookings): restrict management to assigned PIC or super admin

Secure API endpoints with requireBookingManager authorization check
Update confirmation page to prompt for login if unauthorized
Add safe redirect handling to login and guest middleware

server/api/public/bookings/[token]/confirm.post.ts

@@ -1,5 +1,6 @@
 import type { ConfirmBookingResponse } from '~~/shared/booking'
 
+import { requireBookingManager } from '../../../../utils/auth'
 import { confirmBookingByConfirmationToken, getBookingByConfirmationToken, getBookingInventorySummary } from '../../../../utils/booking-repository'
 import { getRequiredRouteParam, httpError } from '../../../../utils/http'
 import { sendBookingTicketReceiptViaWhatsApp } from '../../../../utils/whatsapp'
@@ -12,6 +13,8 @@ export default defineEventHandler(async (event): Promise<ConfirmBookingResponse>
     httpError(404, 'Booking not found')
   }
 
+  await requireBookingManager(event, existingBooking)
+
   if (existingBooking.status === 'confirmed') {
     return {
       booking: existingBooking,